formatting_xml_4.cs

public class Person
{
    [XmlElement(ElementName = "First")]
    public string FirstName { get; set; }
    
    [XmlElement(ElementName = "Last")]
    public string LastName { get; set; }
    
    public int Age { get; set; }
    
    [XmlElement(IsNullable = true)]
    public string Email { get; set; }
    
    public PhoneNumber[] PhoneNumbers { get; set; }

    public bool ShouldSerializeAge()
    {
        // Only serialize Age if 18 or older
        return Age >= 18;
    }
}